Liquid fuel burner



Aug. 4, 1936. J. MCDONALD LIQUID FUEL BURNER Original Filed Sept. 17, 1935 I INVENTOR James/7 7022014 ATTORNEY Patented Aug. 4, 1936 UNITED STATES LIQUID FUEL BURNER James McDonald, Weehawken, N. J., assignor to Todd Combustion Equipment, Inc., New York, N. Y., a corporation of New York Original application September 17, 1935, Serial No. 40,906. Divided and this application November 26, 1935, Serial No. 51,596

3 Claims.

This invention relates to oil burning equipment, particularly for use with locomotive boilers, although also applicable with marine and other boilers, and my improvements, embodied 5 in the present application, which is a division of my application Serial No. 40,906, filed September 17, 1935, are directed in the main to certain novel features wherein the burner employed is of dual capacity, it being capable of functioning,

Fig. 2is an enlarged sectional detail of the dual atomizing device. I

Fig. 3 is a section on the line 3-3 of Fig. 2, and Fig. 4 is a perspective detail view of the atomizing plug.

The relation of the burner assembly to a fur-v nace front is disclosed in my said earlier appli-- cation. Serial No. 40,906, and is made no part of the present application. There is/s'hown herein however the upper portion of an air register housing, indicated at 4, which is provided with anopening in its upper portion, said opening having a surrounding, upstanding ledgeorwall' 9, and

a cover plate I0 for said-opening is recessed as at H to fit over and engage wall 9, suitable packing |2being employed to effect a tight joint.

A panel I3 is slidably mounted at its sides in guideways |4 that are provided in the cover plate I0, said panel bearing a rack |5 on its upper surio face and being capable of sliding movement to and from the furnace mouth. This panel |3 carries the burner assembly and enables the fuel atomizer to be adjusted axially with relation to.

' the furnace mouth, (not shown). 16 A bracket l6, carried by'the cover plate |0,'has a bearing H in which is journalled a shaft l8 that carries'a gear |9 which is in mesh with rack I5, said shaft being operable by a hand crank 20 for rotating gear l9 and thus causing the panel I3 50 bearing the burner assembly to be shifted in either direction.

'I'he'support for the burner assembly comprises a lower block 2| which is secured upon panel l3 as by screws 22, and an upper block-23 56 which has yoke arms 24 that straddle block 2|,

also a hand screw 25, threaded through block 23 and adapted to bear against an intermediate block 26 to bind it and block 2| together. Blocks 2| and 26 have respective concave and convex meeting surfaces to provide liquid tight seats, 5

and they have the aligned passageways 21, 28 for the flow of fuel which enters passageway 21 through a hollow plug 29 that is screwed'into block 2| to effect a junction with said passageway 21. Liquid fuel enters plug 29 through a pipe 30, leading from a source of fuel oil supply (not shown).

The block 26 is provided with a tapered opening 33, which constitutes a valve chamber, in which is revolubly fitted a hollow-tapered valve 34, said valve having the ports 35, 36, and being open at its restricted end for communication with the 'passageway28. The stem 31 of valve 34 has an operating handle .30, and a stufiing box 39, around stem 31, engages the outer portion of opening 33 to render the valve chamber liquid tight.

The wall of the valve chamber in block 29 is pierced with longitudinally aligned orifices 40, 4|, in which-are fitted, as by screw threads, the like ends of respectivetubes 42, 43, which are respectively of different interior diameters.

The opposite ends of tubes 42, 43 are fitted respectively in a block-like, -hollow member 44 which constitutes the delivery portion of the burner assembly, said member including a recessed chamber 45 in which is fitted a tube 46, and a larger, annular chamber 41 that surrounds tube 46. I

The fuel supply tube 42 communicates with a chamber 45 and the tube 43 communicates with chamber 41.

Tube 46 is. provided, at its outer end, with a radial flange 48, whose inner perimeter is bevelled in order that it may find a seat upon the correspondingly bevelled outer perimeter of member 44, said flange forming the outward boundary of chamber 41, and being pierced with a series of orifices 49 for liquid passage. Also the outward face of flange48 (including the end of tube 46) is provided with tangential grooves which communicate from the orifice:

49 to the end interior of tube 46.

An interiorly' threaded, sleeve-like member 5| is slidably fitted in the outer end portion of tube 50 46, and is permitted limited movement therein, its extent of sliding motionv being limited 'inwardly by a shoulder 52 formed in tube 46 at the junction of the larger and'smaller interior diameters of said tube, and being limited outward- 66 ly by an atomizer plate 53 that has a central oriflce 54 and which lies against the inner face of flange 48, which inner face is recessed to leave a wall 55 that encircles the periphery of flange 48.

The inward end of sleeve 5| is of conoidal form and has an atomizing orifice 56 at its apex. It will be noted in the drawing, Fig. 2, that atomizer plate 53, which is of suitable thickness, is provided on its inward surface with a dished or concave clearance of which orifice 54 forms the centre, and that when the conoidal portion of sleeve 5| centers in and closes orifice 54, which it is intended to do in certain uses of the device, as will be pointed out hereinafter, then a clearance 68, that is wedge-shaped in cross-section,

is left between the sleeve cone and the concave clearance in plate 53.

Into the threaded portion of sleeve 5| is screwed an atomizer plug 51 (see Fig. 4) having the longitudinal grooves 58 along its surface which lead into tangential grooves 59 in its conoidal nose portion 60, said nose portion lying against the inner surface of the conoidal portion of sleeve 5|, excepting that the conoidal nose portion of plug 51 is truncated, leaving a whirling chamber 6| for liquid fuel prior to its issuance through atomizing orifice 56.

A clamping nut 62 is shown as screwed upon member 44 and extended over the plate 53, and a flame cone 63 may be fitted upon and secured to said clamping nut.

In this dual burner system it will be noted that for providing a pilot flame fuel is supplied to the burner by way of the smaller tube 42, whilst for heavy duty purposes fuel is supplied by way of the larger tube 43. The flow from the valve chamber in member 26 to tube 42 is through valve port 35 and the flow through the tube 43 is from port 36. These ports 35, 36 are differently disposed in valve 34 in order that one of them may be closed while the other is open, and also so that in certain rotated positions of the valve both ports may be closed.

When using the pilot supply liquid fuel enters chamber 45 in member 44 and the pressure of fuel in tube 46 forces the unit comprising sleeve 5| and plug 51 to slide into the position shown in Fig. 2, where the conoidal portion of sleeve 5| is forced into contact with the orifice 54 in the plate 53, so that the fuel may issue in atomized form from orifice 56.

But, when valve 34 is turned to shut off fuel supply through port 35 and to open port 36, then fuel is supplied through tube 43 to chamber 41,

and, passing under pressure through orifices 49 and grooves 56 to the conoidal portion of sleeve 5|, thereby forces the unit of sleeve 5| and plug 51 outwardly against its seat 52, in this manner providing a clearance in which the fuel issuing from tangential grooves 56 may whirl prior to issuance in atomized form from orifice 54.

Variations within the spirit and scope of my invention are equally comprehended by the foregoing disclosure.

I claim:---

1. Burner assembly means including a member 10 having separate chambers, separate tubes which are adapted to convey liquid fuel respectively to said chambers, separate atomizing means in communication with said chambers respectively, and

movable means in one of said chambers and op- 15 erable in one direction under pressure from one of said tubes to permit the delivery of fuel from said tube to its atomizing means, and operable under pressure from the other of said tubes to permit the delivery of fuel to the other atomizing means.

2. Burner assembly means including a block member having'separate chambers, the outer end of one of the chambers being enlarged, separate tubes of different interior diameters which are adapted to convey liquid fuel respectively to said chambers, separate atomizing means in commu-- nication with said chambers respectively, and movable means slidably mounted in the enlarged portion of one of the chambers and operable in one direction under pressure from one of the tubes to permit the delivery of fuel from said tube to its atomizing means and operable under pressure from the other of said tubes to permit the delivery of fuel to the other atomizing means.

3. Burner assembly means including a block member having an inner chamber, and an outer chamber surrounding said .inner chamber, separate tubes of different interior diameters which are adapted to convey liquid fuel respectively'to 4 said chambers, an atomizer plate having an orifice communicating with said outer chamber, movable means slidably mounted in said inner chamber and normally closing'the orifice in said plate, and atomizing means borne by said movable 4 means and being in communication with said inner chamber, said means being operable in one direction under pressure from one of the tubes to open said orifice to permit the delivery of fuel to said atomizing plate, and being operable in the 5 other direction under pressure from the other of said tubes to close said orifice to permit the delivery of fuel from said tube to the atomizin means .borne by said movable means. 1

JAMES MCDONALD. I 

